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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f656a04fb5bb6a9ec736e1b0fdf567623bc898b1f7836208dfc09263a103b80f' 
  AND token = 'gT10y6jZEr4gcZNYww9/dtkOXQguGpoi5VkPk0KqtUM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}